refactor(tests): convert leftout junit4 based testcases to junit5 (#1018

)

Before refactor, total test cases executed were 275.
After refactor, total test cases executed are 275.

rosco-manifests/src/test/java/com/netflix/spinnaker/rosco/manifests/helmfile/HelmfileTemplateUtilsTest.java

@@ -18,10 +18,10 @@
 
 import static com.netflix.spinnaker.rosco.manifests.ManifestTestUtils.makeSpinnakerHttpException;
 import static org.assertj.core.api.Assertions.assertThat;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.mockito.Mockito.any;
 import static org.mockito.Mockito.doThrow;
 import static org.mockito.Mockito.mock;